[ARROW-17979] [JS] Update status docs

• Type: Task
• Status: In Progress
• Priority: Critical
• Resolution: Unresolved
• Component/s: Documentation, JavaScript
• Labels: pull-request-available
• External issue URL: https://github.com/apache/arrow/issues/20447
• Assignee: Unassigned
• Reporter: Dominik Moritz
• Created: 10/Oct/22 17:36
• Updated: 11/Jan/23 11:57

Description

Arrow JS support nulls, sparse, and dense unions.

Issue Links

• links to: GitHub Pull Request #14365